My 5 year old is the same! He goes down at 8:30, melatonin every night, and wakes up at 6. Regardless of if he naps. The ONLY time hes ever slept late is when he’s up until like 11pm, which is obviously a nightmare. He also wakes up at 2am almost every day, comes into our room whining, and makes us walk him back to his bed. Super obnoxious.